Property and equipment (Tables)

9 Months Ended

Sep. 30, 2016

Property and equipment

Schedule of property and equipment, net

	Estimated			As of		As of
	useful life			September 30,		December 31,
	(in years)			2016		2015
Equipment	2	-	7	$	1,008,798	$	958,175
Computer hardware	3	-	5		3,409,750		3,266,233
Furniture and fixtures	5	-	7		227,851		192,565
Leasehold improvements	3	-	10		786,637		746,336
Total property and equipment, gross					5,433,036		5,163,309
Less: Accumulated depreciation and amortization					(4,111,694)		(3,351,690)
Property and equipment, net				$	1,321,342	$	1,811,619

Schedule of property and equipment depreciation and amortization expense

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2016		2015		2016		2015
Depreciation and amortization expense	$	328,181	$	164,538	$	768,740	$	489,010